In 1978, President Jimmy Carter announced he was deferring development of the neutron bomb, a high-radiation weapon.

In 1983, space shuttle astronauts Story Musgrave and Don Peterson went on the first U.S. spacewalk in almost a decade as they worked in the open cargo bay of Challenger for nearly four hours.

Ten years ago: U.S. troops in more than 100 U.S. armored vehicles rumbled through downtown Baghdad, seizing one of Saddam Hussein's opulent palaces and toppling a 40-foot statue of the Iraqi ruler. The Supreme Court voted 6-3 to uphold a 50-year-old Virginia law making it a crime to burn a cross as an act of intimidation. The Boston Globe won the 2003 Pulitzer Prize for public service for its coverage of the priest sex abuse scandal. Syracuse won the NCAA basketball tournament with an 81-78 victory over Kansas. Actor Russell Crowe married Danielle Spencer in Nana Glen, New South Wales, Australia, on his 39th birthday (the couple separated in 2012).

Five years ago: Anti-China protesters disrupted the Olympic torch relay in Paris, at times forcing Chinese organizers to put out the flame and take the torch onto a bus to secure it. Kansas won the NCAA championship, defeating Memphis 75-68. Coach Pat Riley, Hakeem Olajuwon, Patrick Ewing, Adrian Dantley and broadcaster Dick Vitale were among those selected to Basketball's Hall of Fame.

One year ago: The U.S. warned Syria it wouldn't be able to deceive the world about compliance with a cease-fire that was just days away, as regime forces pounded more opposition strongholds in an apparent rush to crush resistance before troops had to withdraw. Pakistani soldiers dug into a massive avalanche in a mountain battleground close to the Indian border, searching for 140 people buried when the wall of snow engulfed a military complex; there were no survivors. CBS newsman Mike Wallace, 93, died in New Canann, Conn.